emlog模板中获取缩略图不同方法

<?php
//全局匹配正文中的图片并存入imgsrc中
function img_zw($content){preg_match_all("|<img[^>]+src=\"([^>\"]+)\"?[^>]*>|is", $content, $img);$imgsrc = !empty($img[1]) ? $img[1][0] : '';if($imgsrc):return $imgsrc;endif;}
//Custom: 获取附件第一张图片
function img_fj($logid){$db = MySql::getInstance();$sql = "SELECT * FROM ".DB_PREFIX."attachment WHERE blogid=".$logid." AND (`filepath` LIKE '%jpg' OR `filepath` LIKE '%gif' OR `filepath` LIKE '%png') ORDER BY `aid` ASC LIMIT 0,1";$imgs = $db->query($sql);$img_path = "";while($row = $db->fetch_array($imgs)){$img_path .= BLOG_URL.substr($row['filepath'],3,strlen($row['filepath']));}
return $img_path;}?>

<?php if(img_zw($value['content'])){$imgurl = img_zw($value['content']);
}elseif(img_fj($value['logid'])){$imgurl = img_fj($value['logid']);
}else{$imgurl = TEMPLATE_URL.'images/'.rand(1,5).'.jpg';}
?><p><img src="<?php echo $imgurl;?>" /></p>

<?php if(img_zw($value['content'])){$imgurl = img_zw($value['content']);?><p><img src="<?php echo $imgurl;?>" /></p>
<?php }elseif(img_fj($value['logid'])){$imgurl = img_fj($value['logid']);?><p><img src="<?php echo $imgurl;?>" /></p>
<?php }else{}?>